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Take a look at the LDSHBL model in the MODELS.pdf documentation. For your example, you can add something similar to the following to your .dyr: 3, 'LDSHBL', '1', 49.5, 0.2, 0.5, 0, 0, 0, 0, 0, 0, 0.05 /

Where 3 is the bus number, '1' is the load ID, 49.5 is your setpoint frequency for shedding, 0.2 is the pickup time of the relay, 0.5 is the pu amount of load to shed, and 0.05 is the breaker time. Of course, your delays might be a bit different and would depend on your relay and breaker timings.